In-vitro Assessment of the Gloss Efficacy of Three Marketed Toothpastes

Objectives: To evaluate the ability of two commercially available toothpastes to deliver gloss to teeth using a validated accelerated gloss model (AGM).
Methods: Two silica whitening toothpastes containing blue covarine and one commercially available regular silica toothpastes were tested. Baseline values of unstained bovine incisors were measured using the Novo-Curve (60°) gloss meter and samples were divided into four groups (n=6). The gloss was measured at four 90° rotations of each of the enamel specimens and the average reported. Trays were prepared for the brushing machine by adding the toothpaste slurries. Teeth were brushed for 800, 1600 and 2400 strokes with a medium toothbrush after that the specimens were remeasured. The increase in gloss relative to the baseline gloss value was reported as change in Gloss Units (△ GU).
Results: △ GU increase for Study 1
Test Product; After 800 strokes; After 1600 strokes; After 2400 strokes;
Silica whitening toothpaste with blue covarine 1 6.82 (0.23) A (*); 9.43 (0.29) A; 11.44 (0.34) A;
Regular silica toothpaste 4.05 (0.17) B; 6.29 (0.15) B; 7.55 (0.25) B;

△ GU increase for Study 2
Test Product; After 800 strokes; After 1600 strokes; After 2400 strokes;
Silica whitening toothpaste with blue covarine 2 6.47 (0.26) A (*); 9.00 (0.30) A; 11.10 (0.43) A;
Regular silica toothpaste 3.92 (0.18) B; 6.53 (0.14) B; 8.18 (0.13) B;
(*) Different capital letters indicate statistical significance (p < 0.05) between test products;
Conclusions: The studies showed that both silica whitening toothpastes containing blue covarine gave a statistical superior gloss improvement effect compared to the regular silica toothpaste.